Preparation of heterocyclic block copolymer from perfluoroalkylene oxide .alpha., .omega.-diamidoximes
Diamidoxime monomers having the formula: ##STR1## are intermolecularly and thermally condensed to form a heat and chemical resistant polymer containing 1,2,4-oxadiazole linkages and having the formula: ##STR2## wherein R represents identical bivalent organic radicals or any combination of bivalent organic radicals selected from the group consisting of --(CX.sub.2).sub.p --, wherein p ranges from 2 to 8 when X is fluorine and 2 to 18 when X is hydrogen, chlorine, nitro or aryl; arylene; and an oligometric or polymeric radical prepared by reacting a dicarboxylic acid halide with a fluorinated epoxide and having the formula:CFY(OCF.sub.2 CFY).sub.m O(CX.sub.2).sub.p O(CFYCF.sub.2 O).sub.n CFYwherein Y is fluorine or trifluoromethyl, X is nitro, aryl, hydrogen, chlorine or fluorine, preferably the latter, p ranges from 1 to 18 and m+n ranges from 2 to 7.
Claims
1. A process for preparing a heat and chemical resistant polymer having the formula: ##STR10## wherein y is an integer of at least 2 and is commensurate with a molecular weight range of about 3000 to about 50,000, and R represents identical bivalent organic radicals or any combination of bivalent organic radicals selected from the group consisting of --(CX.sub.2).sub.p --, wherein p ranges from 2 to 8 when X is fluorine and 2 to 18 when X is hydrogen, chlorine, nitro or aryl; arlene; and an oligomeric or polymeric radical prepared by reacting a dicarboxylic acid halide with a fluorinated epoxide and having the formula:
- thermally condensing a diamidoxime monomer of the formula: ##STR11## wherein R is as defined above.
2. The process of claim 1, wherein the heating is carried out at temperature within the range of about 100 to about 250.degree. C. for a period of 2 hours to 96 hours.
3. The process of claim 1, wherein said condensation reaction is conducted in the substantial absence of oxygen.
4. The process of claim 1, wherein said bivalent organic radical contains at least one bivalent perfluorinated polyalkyl ether radical.
5. The process of claim 4, wherein said perfluorinated polyalkyl ether radical is one or two moieties of the formula:
7. A heat and oxygen resistant polymeric material containing 1,2,4-oxadiazole linking groups and having the formula: ##STR12## wherein y is an integer of at least 2 and is commensurate with a molecular weight range of about 3000 to about 50,000 and R is a bivalent fluorinated aliphatic radical as defined in claim 5.
| 3275608 | September 1966 | Montgomery et al. |
| 3484389 | December 1969 | Iwakura et al. |
| 3960814 | June 1, 1976 | Cochoy |
Type: Grant
Filed: Oct 17, 1977
Date of Patent: Mar 20, 1979
Inventors: Robert A. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Frosch (Sunnyvale, CA), Leonard O. Ross (Sunnyvale, CA), Robert W. Rosser (San Jose, CA)
Primary Examiner: Earl A. Nielsen
Attorneys: Armand McMillan, John R. Manning, Darrell G. Brekke
Application Number: 5/843,090
International Classification: C08G 7306;
